netdev - Re: [PATCH net] team: prevent ipv6 link local address on port devices

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Message-ID: <Y4731q0/oqwhHZod@nanopsycho>
Date:   Tue, 6 Dec 2022 09:05:42 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org, Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, LiLiang <liali@...hat.com>
Subject: Re: [PATCH net] team: prevent ipv6 link local address on port devices

Mon, Dec 05, 2022 at 06:46:05PM CET, lucien.xin@...il.com wrote:
>The similar fix from commit c2edacf80e15 ("bonding / ipv6: no addrconf
>for slaves separately from master") is also needed in Team. Otherwise,
>DAD and RS packets to be sent from the slaves in turn can confuse the
>switches and cause them to incorrectly update their forwarding tables
>as Liang noticed in the test with activebackup mode.
>
>Note that the patch also sets IFF_MASTER flag for Team dev accordingly
>while IFF_SLAVE flag is set for port devs. Although IFF_MASTER flag is
>not really used in Team, it's good to show in 'ip link':
>
>  eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>
>  team0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP>
>
>Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device")
>Reported-by: LiLiang <liali@...hat.com>
>Signed-off-by: Xin Long <lucien.xin@...il.com>

Nack. Please don't do this. IFF_MASTER and IFF_SLAVE are historical
flags used by bonding and eql. Should not be used for other devices.

addrconf_addr_gen() should not check IFF_SLAVE. It should use:
netif_is_lag_port() and netif_is_failover_slave() helpers.